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Fibrous Composite Failure Criteria with Material Degradation for Finite Element Solvers

a composite failure and solver technology, applied in the field of application, can solve problems such as the detection of composite failure based on the updated model

Active Publication Date: 2019-12-19
UNITED STATES OF AMERICA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention relates to modeling fibrous composites to detect and predict failures. The method involves obtaining material properties for a model of the composite, decomposing the stresses and strains at the integration points into component levels, applying a material reduction model to detect component failure, and incorporating the updated material properties into the model. The model can predict composite failure based on the updated material properties. The invention can be used for various fibrous composites and failure modes.

Problems solved by technology

At this stage, a composite failure is detected based on the updated model.

Method used

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  • Fibrous Composite Failure Criteria with Material Degradation for Finite Element Solvers
  • Fibrous Composite Failure Criteria with Material Degradation for Finite Element Solvers
  • Fibrous Composite Failure Criteria with Material Degradation for Finite Element Solvers

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Embodiment Construction

[0020]Embodiments described herein attempt to reconcile the performance of a composite as the collection of constituent materials and their interactions for a range of composite materials. An established multiscale model for materials is used as the basis for a failure model for fiber composites. The model's computation is explained so that its results can be used to formulate the inputs to the failure model. The failure model proposed employs homogenization and disaggregation methods that are enabled by micro-scale modeling of the material's constituents. This failure model is then used to define strength reductions in the composite at the micro-level. The strength reductions enable the definition of a progressive failure methodology for application to the micro-scale, and ultimately, the macro-scale composite. The failure model, the degradation model, and the multi-scale model they are based upon are combined in a computational program for inclusion in finite element software for ...

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Abstract

A method and system for modeling fibrous composites. Initially, material properties are obtained for a model of a fibrous composite, where the model includes integration points and unit cells. For each integration point, composite level stresses and strains are determined based on the material properties, the composite level stresses and strains are decomposed into component level stresses and strains for the integration point, the component level stresses and strains are used to calculate failure quotients at the integration point, an appropriate material reduction model is applied at a component level based on the failure quotients to detect a component failure, the component failure is upscaled to determine updated material properties at a composite level, and the updated material properties are incorporated into the model. At this stage, a composite failure is detected based on the updated model.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims the benefit of U.S. Provisional Application No. 62 / 684,889, filed Jun. 14, 2018, which is hereby incorporated in its entirety by reference.BACKGROUND OF THE INVENTION1. Field of the Invention[0002]The present invention relates generally to methods and systems for applying fibrous composite failure criteria with material degradation to finite element solvers.2. Description of the Related Art[0003]In recent years, two prominent investigations into the characterization and prediction of composite failure, the World-Wide Failure Exercise I and II, have been initiated and completed in 2004 and 2013. The investigations explore the effectiveness and utility of many different composite failure theories against many sets of experimental data. The World-Wide Failure Exercise (WWFE) was prompted mostly because many theories have been put forth to understand the ultimate strength of composites. Most of these theories begin fro...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G06F17/50
CPCG06F2217/16G06F17/5018G06F30/23G06F2111/10G06F2113/26
Inventor DARCY, JOSEPHKWON, YOUNG WUK
Owner UNITED STATES OF AMERICA
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